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While Grimace's Birthday seems to be a web-browser game mimicking the "retro" graphics of the Game Boy Color, it is actually a real Game Boy Color ROM being run in an emulator, and it's possible to extract the ROM and play it on a Game Boy Color or hardware that is compatible with its cartridges. Because the game was designed specifically for the system, its data includes an error screen typical of those found on other Game Boy Color titles that are incompatible with the original Game Boy. However, because Grimace's Birthday is intended to be played on McDonald's official website (which does not allow the player to switch between Game Boy and Game Boy Color mode), this screen is not viewable.
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When asked about Ronald McDonald's absence in Grimace's Birthday, artist and designer Tom Lockwood responded:
"We were not allowed to include Ronald in the game. In the end, this game is about Grimace – who is my personal favourite of the lot anyway – and including Ronald would have potentially stolen the spotlight. In any case, I think it's nice to give the side crew of the McDonald’s mascots time in the spotlight all to their own. McDonald’s wanted to include a retro cake they used to produce in the '80s. It can be seen in the form of one of the three cakes during the final mini-game and has a birthday note to Grimace from Ronald, so at least his presence is felt to some degree."
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The telephone line level of Grimace's Birthday was supposed to have energy running through the cables as a hazard, but this was objected to by McDonald's and replaced with a squirrel Grimace could bounce off of.
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